To store username and passsword of anything like github, dockerhub
From Jenkins dashboard, click on Manage Jenkins
Click on Manage Credentials
Click on Jenkins
Click on Global credentials
Click on Add Credentials
Select kind as Username with password, enter username, password and enter unique id and click on OK
To store ssh private key
Click on Add Credentials Select kind as SSH Username with private key enter the username, click on Enter directly and then click on Add and paste your private key and click on ok
To store any token eg: gitlab, Jfrog, artifactory and sonarqube token
Click on Add Credentials Select kind as Secret text enter the token, id and click on OK
